Carbon holder



Feb. 21, 192s.

. 1,659,576 G. D. BRADY l-:T AL

CARBON HOLDE Filed Apr; 17, 1922 LA a B5 'MY @uw www Patented Feb. 21,1928.

UNITED STATES 1,659,576 PATENT OFFICE.

GLEN D. BRADY, OF DETROIT, MICHIGAN, AND ALVAH C. ROEBUCK, 0F CHICAGO,ILLINOIS, ASSIGNORS '10 THE ENTERPRISE OPTICAL MANUFACTURING COMPANY, OFCHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

CARBON HOLDER.

Application led April 17, 1922. Serial No. 554,064.

Our invention relates to carbon holders and has for one of its objectsthe provision of a simple and eiicient carbon holder particularlyadaptable for project-ion apparatus, but it may be utilized for holdingall kinds of electrical arc carbons.

A further object is the provision of a carbon holder having theadjusting part of the carbon clamp positioned at a distance away fromthe carbon so as to facilitate the operation and adjustment of theholder.

A still further object is the provision of a carbon holder of thecharacter mentioned, eicient in operation and adapted to give maximumservice.

Other objects will lappear hereinafter.

An embodiment of our invention is illustrated in-the accompanyingdrawing forming a part of this specification and in which- Fig. 1 is atop view of a carbon clamp and mounting embodying our invention withportions cut way to expose underlying parts;

Fig. 2 is a vertical section taken through the carbon clamp; and

Figs. 3 and 4 are sections taken on lines 3-3 and 4 4, respectively, ofFig. 2.

Referring more particularly to the drawing, a support 5 is indicated forholding the carbon holder. This support may be the supporting arm of anarc lamp of any desired or preferred construction. It will be understoodthat two of these arms 5 are used in each lam and also two of the carbonholders will e necessary.

Our improved carbon holder comprises a tubular member 6 mounted on anarm 5 by screws 7, or their equivalent. The member 6 is insulated fromthe arm 5 and screws 7 by insulation material 8, such as mica, or anyother desired substance. This insulation is applied in the usual manner.

The member 6 is preferably hollow and provided with arms 9 at its outerend which reach around a space 10 in which the carbon 11 is to be held.These arms 9 are arranged s0 as to form a substantially C-shaped clampwith the opening directed, away from the hollow or tubular opening 12 inthe member 6. Theopening 10 is preferably large enough to permit the useof the largest size carbon that may be desirable.

Disposed within the tubular opening 12 is a clamp member 13 which ispreferably small enough to permit its movement freely in the opening 12when the parts are heated in use. One end of the member 13 is V-shapedas at 14 t o engage the carbon and clamp it tightly against the arms 9,as clearly indicated in Fig. 2. A screw 15 is threaded in the wall ofmember 6 and extends into opening 12 with 'its end disposed within agroove 16 in one slde of the member 13 so as to prevent rotation of thelatter. The end of member 13 away from 'the carbon opening is preferablyenlarged as at 17 so as to guide the rear end of the member 13 in itsopening. The tubular` member 6 may have a portion 17 .projecting intothe opening 12 for engaging the member 13 to support the carbonengaglnend of the latter. The members 17 and 1 provide means for mountingmember 13 in member 6 with minimum contactlng surfaces. This has theadvanta e of reducing interference from rust, car on ash, dirt,expansion from heat, etc., between said members. It will be a parentthat members 17 and 17 may be eliminated when so deirecfl; and member 13fitted loosely in mem- The member 13 has a recess 18 in its rear end inwhich a screw 19 extends. The screw 19 preferably has an annular groove20 in which are disposed one or more pins 21. The pins 21 are secured inthe member 13 and disposed in the groove 20 so as to hold the member 13against relative longitudinal movement with respect to screw 19.

A plug 22 is held in the opening 12 by screws 23, or their equivalent.These screws are indicated as being attached in a manner so as to holdthe block 13 both against rotary and longitudinal movements in theopening 12, as clearly indicated in Figs. 2 and 4.

A conductor connection 24 may be attached to the member 6 by screws 25,or their equivalent. The conductor 24 may be of any approved design andconstruction.

In use, the screw 19 is adjusted longitudinally until the end 14 clampsthe carbon against arms 9. The screw and its connection with member 13is situated a considerable distance from the carbon so as to preventthese parts becoming set due to overheat and oxidation. The member 13 issmall enough, as already pointed out, adjacent the carbon to prevent itsexpansion through heating from binding it in opening 12 and lOltherefore prevent its sticking. It will be apparent also that by lacingthe screw at a distance from the car on it can be adusted at any time.The screw 19 preferab y engages the bottom of the recess 18 so that'nopressure is on the pins 21 during clamping the carbon; said pins simplyare used to vithdraw the clamp when loosening the car- The openingbetween the free ends of prongs 9 has a two-fold object, one of which isto assist in alining the two carbons wlth each other, and the otherobject is that th1s opening is of especial benefit in the upper carbonholder when the carbon is burnt to a point near the carbon holder, inwhich case the ame from the arc does not overheat the carbon holder.

We claim 1. A carbon clamp comprising a member having a carbon-engagingportion rovided with an opening for recelving acar n and having aguideway arranged transversely of said opening; a movablecarbon-engaging member adjustably mounted in said guideway and spacedfrom the walls thereof and having a portion cooperating with thecarbon-engaging portion of said member and spacing means to preventbinding between said carbon engaging member and its guideway.

2. A carbon clamp comprising a tubular member having a carbon-enga ngarm at one end thereof; a clamp mem er slidably mounted in the tubularmember with a carbon-engaging portion at Aone end; means for spacingsaid clamp member from the walls of said tubular member, and means foradjusting the clamp member in said tubular member.

3. A carbon clamp comprising a tubular member; a clamp member disposed-within said tubular member, combined spacin and supporting meansproviding limited s lding engagement between said tubular member andsaid clamp member to hold the walls of said members in spaced relationto each other, said clamp member being suiiiciently small so as to beeasily movable while the parts are in highly heated condition; and ascrew mounted in the tubular member and engaging the clamp member forlongitudinal adjustment of the latter in said tubular member.

4. A carbon clamp comprising a member having a carbon-engaging armthereon; a

maarre clamp member slidably mounted with relation to thefirst-mentioned member toward and away from sai-d arm; a removable plugin said first-mentioned member having a threaded opening therein, and anadjusting screw having end thrust bearing in sai plug for moving theclamp member toward and away from said arm.

5. A carbon clamp comprising a tubular member having carbon-engagingarms curved toward each other; a clamp member mounted in said tubularmember and having a recess in one end; andl a screw adjustably mountedin the tubular member with one end engaging the recess in said clampmember. l

6. A carbon clamp comprising a tubular member having carbon-engagingarms curved toward each other; a clamp member mounted in said tubularmember and having a recess in one end; a screw adjustably mounted in thetubular member with one end engaging the recess in said clamp member;and means connected with the screw and clamp member for holding suchmembers against relative longitudinal movements.

7. A carbon clamp comprising a tubular member having a C-shaped openingat one end; a clamp member mounted in the tubular member and movabletoward and away from the open side of said C-shaped opening; a screwadjustably mounted in the tubu ar member; and means holding the screwagainst relative longitudinal movements with respect to the clampmember.

8. A clamp member comprising a tubular member having carbon-engagingarms extending toward each other; a carbon clamp having an angular endadjacent said carbonengaging arms and a recess in its other end; a blockheld in said tubular member; a screw threaded in said block andextending into said recess; and pins mounted in said clamp member andengaging said screw for holding the clamp member against relativelongitudinal lmovements with respect to the screw.

In testimony whereof I have signed my name to this specilication on this12th day of April A. D. 1922.

ALVAI-I C. ROEBUCK.

In testimony whereof I have signed my name to this specification on this11 day of April, A. D. 1922.

GLEN D. BRADY.

